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SECURITIES AVAILABLE FOR SALE, HELD TO MATURITY, AND MARKETABLE EQUITY SECURITIES - Summary of Securities with Unrealized Losses (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available for sale securities, less than twelve months, gross unrealized losses $ 515 $ 1,576
Available for sale securities, over twelve months, gross unrealized losses 3,303 24,115
Available for sale securities, continuous unrealized loss position, accumulated loss 3,818 25,691
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Available for sale securities, continuous unrealized loss position, less than twelve months, fair value 90,256 130,805
Available for sale securities, continuous unrealized loss position, over twelve months, fair value 287,645 992,767
Available for sale securities, continuous unrealized loss position, fair value 377,901 1,123,572
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, accumulated loss 0 192
Held-to-maturity securities, continuous unrealized loss position, over twelve months, gross unrealized losses 1,435 6,471
Held to maturity securities, accumulated unrecognized holding loss 1,435 6,663
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Held to maturity securities, accumulated unrecognized holding loss, less than twelve months, fair value 0 25,674
Held to maturity securities, accumulated unrecognized holding loss, over twelve months, fair value 24,078 170,459
Held to maturity securities, accumulated unrecognized holding loss, fair value 24,078 196,133
Securities available for sale and held to maturity    
Held to maturity and available for sale securities continuous unrealized loss position, less than twelve months, aggregate losses 515 1,768
Held to maturity and available for sale securities continuous unrealized loss position, less than twelve months, fair value 90,256 156,479
Held to maturity and available for sale securities continuous unrealized loss position, over twelve months, aggregate losses 4,738 30,586
Held to maturity and available for sale securities continuous unrealized loss position, over twelve months, fair value 311,723 1,163,226
Held to maturity and available for sale securities continuous unrealized loss position, aggregate losses 5,253 32,354
Held to maturity and available for sale securities continuous unrealized loss position, fair value 401,979 1,319,705
Municipal bonds and obligations    
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available for sale securities, less than twelve months, gross unrealized losses 0 55
Available for sale securities, over twelve months, gross unrealized losses 5 658
Available for sale securities, continuous unrealized loss position, accumulated loss 5 713
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Available for sale securities, continuous unrealized loss position, less than twelve months, fair value 0 3,186
Available for sale securities, continuous unrealized loss position, over twelve months, fair value 1,319 11,787
Available for sale securities, continuous unrealized loss position, fair value 1,319 14,973
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, accumulated loss   127
Held-to-maturity securities, continuous unrealized loss position, over twelve months, gross unrealized losses   3,474
Held to maturity securities, accumulated unrecognized holding loss   3,601
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Held to maturity securities, accumulated unrecognized holding loss, less than twelve months, fair value   17,596
Held to maturity securities, accumulated unrecognized holding loss, over twelve months, fair value   103,759
Held to maturity securities, accumulated unrecognized holding loss, fair value   121,355
Agency collateralized mortgage obligations    
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available for sale securities, less than twelve months, gross unrealized losses 72 76
Available for sale securities, over twelve months, gross unrealized losses 509 15,116
Available for sale securities, continuous unrealized loss position, accumulated loss 581 15,192
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Available for sale securities, continuous unrealized loss position, less than twelve months, fair value 43,755 39,114
Available for sale securities, continuous unrealized loss position, over twelve months, fair value 103,929 755,528
Available for sale securities, continuous unrealized loss position, fair value 147,684 794,642
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, accumulated loss 0 0
Held-to-maturity securities, continuous unrealized loss position, over twelve months, gross unrealized losses 115 778
Held to maturity securities, accumulated unrecognized holding loss 115 778
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Held to maturity securities, accumulated unrecognized holding loss, less than twelve months, fair value 0 0
Held to maturity securities, accumulated unrecognized holding loss, over twelve months, fair value 10,648 43,138
Held to maturity securities, accumulated unrecognized holding loss, fair value 10,648 43,138
Agency mortgage-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available for sale securities, less than twelve months, gross unrealized losses 5 53
Available for sale securities, over twelve months, gross unrealized losses 1,074 5,068
Available for sale securities, continuous unrealized loss position, accumulated loss 1,079 5,121
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Available for sale securities, continuous unrealized loss position, less than twelve months, fair value 2,191 5,500
Available for sale securities, continuous unrealized loss position, over twelve months, fair value 93,990 162,439
Available for sale securities, continuous unrealized loss position, fair value 96,181 167,939
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, accumulated loss 0 0
Held-to-maturity securities, continuous unrealized loss position, over twelve months, gross unrealized losses 57 297
Held to maturity securities, accumulated unrecognized holding loss 57 297
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Held to maturity securities, accumulated unrecognized holding loss, less than twelve months, fair value 0 0
Held to maturity securities, accumulated unrecognized holding loss, over twelve months, fair value 6,701 6,922
Held to maturity securities, accumulated unrecognized holding loss, fair value 6,701 6,922
Agency commercial mortgage-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available for sale securities, less than twelve months, gross unrealized losses 0 44
Available for sale securities, over twelve months, gross unrealized losses 1,089 3,231
Available for sale securities, continuous unrealized loss position, accumulated loss 1,089 3,275
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Available for sale securities, continuous unrealized loss position, less than twelve months, fair value 0 1,503
Available for sale securities, continuous unrealized loss position, over twelve months, fair value 55,319 57,422
Available for sale securities, continuous unrealized loss position, fair value 55,319 58,925
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, accumulated loss   0
Held-to-maturity securities, continuous unrealized loss position, over twelve months, gross unrealized losses   289
Held to maturity securities, accumulated unrecognized holding loss   289
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Held to maturity securities, accumulated unrecognized holding loss, less than twelve months, fair value   0
Held to maturity securities, accumulated unrecognized holding loss, over twelve months, fair value   10,128
Held to maturity securities, accumulated unrecognized holding loss, fair value   10,128
Corporate bonds    
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available for sale securities, less than twelve months, gross unrealized losses 434 1,249
Available for sale securities, over twelve months, gross unrealized losses 620 7
Available for sale securities, continuous unrealized loss position, accumulated loss 1,054 1,256
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Available for sale securities, continuous unrealized loss position, less than twelve months, fair value 37,147 74,434
Available for sale securities, continuous unrealized loss position, over twelve months, fair value 30,036 2,561
Available for sale securities, continuous unrealized loss position, fair value 67,183 76,995
Trust preferred securities    
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available for sale securities, less than twelve months, gross unrealized losses 4 99
Available for sale securities, over twelve months, gross unrealized losses 0 0
Available for sale securities, continuous unrealized loss position, accumulated loss 4 99
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Available for sale securities, continuous unrealized loss position, less than twelve months, fair value 7,163 7,068
Available for sale securities, continuous unrealized loss position, over twelve months, fair value 0 0
Available for sale securities, continuous unrealized loss position, fair value 7,163 7,068
Other bonds and obligations    
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available for sale securities, less than twelve months, gross unrealized losses 0 0
Available for sale securities, over twelve months, gross unrealized losses 6 35
Available for sale securities, continuous unrealized loss position, accumulated loss 6 35
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Available for sale securities, continuous unrealized loss position, less than twelve months, fair value 0 0
Available for sale securities, continuous unrealized loss position, over twelve months, fair value 3,052 3,030
Available for sale securities, continuous unrealized loss position, fair value 3,052 3,030
Tax advantaged economic development bonds    
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, accumulated loss 0 65
Held-to-maturity securities, continuous unrealized loss position, over twelve months, gross unrealized losses 1,263 1,633
Held to maturity securities, accumulated unrecognized holding loss 1,263 1,698
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Held to maturity securities, accumulated unrecognized holding loss, less than twelve months, fair value 0 8,078
Held to maturity securities, accumulated unrecognized holding loss, over twelve months, fair value 6,729 6,512
Held to maturity securities, accumulated unrecognized holding loss, fair value $ 6,729 $ 14,590